| Value | Category | 
                                    
                    
                        | 0 | No iodine | 
                                    
                    
                        | 1 | Iodine present | 
                                    
                    
                        | 3 | household uses salt but no salt available | 
                                    
                    
                        | 4 | Household does not use salt | 
                                    
                    
                        | 6 | Salt not tested | 
                            
            Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.